Guernsey in September: where is it warmest?
In September, Saint Peter Port averages 17 °C by day.
All destinations in September, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
| Place | Score | Air | Sea | Sun | Rain days |
|---|---|---|---|---|---|
| Saint Peter Port | 76 | 17° | 17° | 6 h | 9 |
Guernsey in September: quick answers
Guernsey in September: where is it warmest?
The warmest places in September are Saint Peter Port (17 °C).
Guernsey in September: where is the sea warmest?
The sea is warmest at Saint Peter Port (17 °C).
Guernsey in September: where is the weather best?
The best holiday weather in September – warm, sunny and dry – is in Saint Peter Port.
Guernsey month by month
Guernsey: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences